Oxygen-17NMR study of defects in LnO1.5-CeO2 (Ln = La and Nd)

Mariko Ando; Itaru Oikawa; Shinobu Ohki; Masataka Tansho; Tadashi Shimizu; Hideki Maekawa; Hajime Kiyono

doi:10.1246/cl.2013.57

Oxygen-17NMR study of defects in LnO_1.5-CeO₂ (Ln = La and Nd)

Mariko Ando, Itaru Oikawa, Shinobu Ohki, Masataka Tansho, Tadashi Shimizu, Hideki Maekawa, Hajime Kiyono

研究成果: Article › 査読

2 被引用数 (Scopus)

抄録

The local structure around the oxide ions in LnO_1.5-CeO ₂ (Ln = La, Nd) was studied by using 17ONMR spectroscopy. Each spectrum of LnO_1.5-CeO₂ showed a broad peak due to a distribution of oxygen tetrahedra. From the peak separation, the relative numbers of oxygen tetrahedra, O[Ce]₄, O[Ce]₃[Ln], and O[Ce]₂[Ln]₂, were determined quantitatively. In the La₂O₃CeO₂ system, the amounts of O[Ce] ₄, O[Ce]₃[Ln], and O[Ce]₂[Ln]₂ deviated from the calculated value for over 20 mol% La-doped ceria (LDC). The distribution of oxygen tetrahedra for LaO1.5CeO2 differed from those in LnO _1.5CeO₂ (Ln = Nd, Y). These results suggest that the stability of the oxygen tetrahedra changes with the size of the doped ions.

本文言語	English
ページ（範囲）	57-59
ページ数	3
ジャーナル	Chemistry Letters
巻	42
号	1
DOI	https://doi.org/10.1246/cl.2013.57
出版ステータス	Published - 2013 1月

ASJC Scopus subject areas

化学 (全般)

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10.1246/cl.2013.57

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title = "Oxygen-17NMR study of defects in LnO1.5-CeO2 (Ln = La and Nd)",

abstract = "The local structure around the oxide ions in LnO1.5-CeO 2 (Ln = La, Nd) was studied by using 17ONMR spectroscopy. Each spectrum of LnO1.5-CeO2 showed a broad peak due to a distribution of oxygen tetrahedra. From the peak separation, the relative numbers of oxygen tetrahedra, O[Ce]4, O[Ce]3[Ln], and O[Ce]2[Ln]2, were determined quantitatively. In the La2O3CeO2 system, the amounts of O[Ce] 4, O[Ce]3[Ln], and O[Ce]2[Ln]2 deviated from the calculated value for over 20 mol% La-doped ceria (LDC). The distribution of oxygen tetrahedra for LaO1.5CeO2 differed from those in LnO 1.5CeO2 (Ln = Nd, Y). These results suggest that the stability of the oxygen tetrahedra changes with the size of the doped ions.",

author = "Mariko Ando and Itaru Oikawa and Shinobu Ohki and Masataka Tansho and Tadashi Shimizu and Hideki Maekawa and Hajime Kiyono",

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AU - Ando, Mariko

AU - Oikawa, Itaru

AU - Ohki, Shinobu

AU - Tansho, Masataka

AU - Shimizu, Tadashi

AU - Maekawa, Hideki

AU - Kiyono, Hajime

PY - 2013/1

Y1 - 2013/1

N2 - The local structure around the oxide ions in LnO1.5-CeO 2 (Ln = La, Nd) was studied by using 17ONMR spectroscopy. Each spectrum of LnO1.5-CeO2 showed a broad peak due to a distribution of oxygen tetrahedra. From the peak separation, the relative numbers of oxygen tetrahedra, O[Ce]4, O[Ce]3[Ln], and O[Ce]2[Ln]2, were determined quantitatively. In the La2O3CeO2 system, the amounts of O[Ce] 4, O[Ce]3[Ln], and O[Ce]2[Ln]2 deviated from the calculated value for over 20 mol% La-doped ceria (LDC). The distribution of oxygen tetrahedra for LaO1.5CeO2 differed from those in LnO 1.5CeO2 (Ln = Nd, Y). These results suggest that the stability of the oxygen tetrahedra changes with the size of the doped ions.

AB - The local structure around the oxide ions in LnO1.5-CeO 2 (Ln = La, Nd) was studied by using 17ONMR spectroscopy. Each spectrum of LnO1.5-CeO2 showed a broad peak due to a distribution of oxygen tetrahedra. From the peak separation, the relative numbers of oxygen tetrahedra, O[Ce]4, O[Ce]3[Ln], and O[Ce]2[Ln]2, were determined quantitatively. In the La2O3CeO2 system, the amounts of O[Ce] 4, O[Ce]3[Ln], and O[Ce]2[Ln]2 deviated from the calculated value for over 20 mol% La-doped ceria (LDC). The distribution of oxygen tetrahedra for LaO1.5CeO2 differed from those in LnO 1.5CeO2 (Ln = Nd, Y). These results suggest that the stability of the oxygen tetrahedra changes with the size of the doped ions.

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